var isTrue = jkr.isMatch(/^\d+/, '1a');
alert(isTrue);

var m = jkr.match(/^((.:).+\\)((.+)(\..+))$/, "C:\\1\\2\\3\\456.mp3");
alert(m.success);
if(m.success) {
    alert("index = " + m.index + "\r\n"
        + "value = " + m.value + "\r\n"
        + "length = " + m.length + "\r\n"
        + "groups(0) = " + m.groups(0) + "\r\n"
        + "groups(1) = " + m.groups(1) + "      文件路径\r\n"
        + "groups(2) = " + m.groups(2) + "      根目录\r\n"
        + "groups(3) = " + m.groups(3) + "      文件名\r\n"
        + "groups(4) = " + m.groups(4) + "      无后缀文件名\r\n"
        + "groups(5) = " + m.groups(5) + "      后缀名\r\n"
        + "groups.count = " + m.groups.count 
        );
}

var mc = jkr.matches(/\d+(\d+)/, "1a23bc456");
for(var i in mc) {
    var m = mc[i];
    if(m.success) {
        alert("index = " + m.index + "\r\n"
            + "value = " + m.value + "\r\n"
            + "length = " + m.length + "\r\n"
            + "groups(1) = " + m.groups(1) + "\r\n"
            + "groups.count = " + m.groups.count
            );
    }
}

var str = "2013年8月25日";
var res = jkr.replace(str, /(\d+)年(\d+)月(\d+)日/, "$1-$2-$3");
alert(res);